Construct a confidence interval for the given difference

Reference no: EM131744573

Assignment

Suppose the number of equipment sales and service contracts that a store sold during the last six months for treadmills and exercise bikes was as follows:

                            Treadmill            Exercise Bike
Total sold             185                    123
Service contracts       67                     55

The store can only sell a service contract on a new piece of equipment. Of the 185 treadmills sold, 67 included a service contract and 118 did not.

Complete the following answers below:

1) Construct a 95 percent confidence interval for the difference between the proportions of service contracts sold on treadmills versus exercise bikes.

2) Is there a major difference between the two pieces of equipment? Why or why not?

Reference no: EM131744573

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